Gas-engine.



F. M. DAVIS.

GAS ENGINE.

.APPLICATIQN FILED Nov,1. 1915.

. 3 v Patented Jan. 23,1917.

FRANK M. DAVIS, 01 MILWAUKEE, WISCONSIN- GAS-ENGINE.

Specification of Letters Patent.

Patented an 23, 1917.

Application filed November 1, 1915. Serial Ito. 58,994.

To all euhom it may concern l 3e it known that I, FRANK M. DAVIS, acitizen of the United States, and resident of -Milwaukee. in the countyof lifilwaukee and State of Wisconsin, have invented new and usefulImprovements in Gas-Engines, of which the following is a description,reference being had to the accompanying drawings, which are a part ofthis specification.

This invention has for its objectito provide for the longitudinalexpansion of the cylinder wall of a gas engine without permitting aleakage of the water in the surrounding water jacket.

The invention comprises a cylinder wall made separate from the waterjacket casing and the cylinder head and clamped at one end between themwhile its other end slidably fits in the water jacket casing so as to becapable of longitudinal sliding movement therein with an expansiblewater tight packing therebetween permitting of such longitudinalmovements of the cylinder wall without allowing the water to leak fromthe water jacket.

With the above and other objects in view the invention consists in thegas engine as herein claimed and all equivalents.

Referring to the accompanying drawing in which like characters ofreference indicate the same parts in different views: Figure 1 is acentral longitudinal sectional view of one cylinder and a portion of theadjacent cylinder of the gas engine constructed in accordance with thisinvention: Fig. 2 is a detail view showing one of the clamping bolts forclamping the cylinder head and the cylinder jacket together with theflange of the cylinder wall between them: and, Fig. 3 is anenlarged-detail view of the expansion joint between the lower end of thecylinder wall and the cylinder jacket.

In this drawing 10 indicates a cylinder wall having a piston 11 fittingtherein, pro- -videdwith an outwardly extending annular flange 12 aroundits upper end which rests upon the closed upper end of the cylinderjacket 13. The cylinder jacket forms a casing surrounding the cylinderwall with a space therebetween for containinq the cooling water andpreferably constitutes an integral part of the upper section of thecrank case.

A. hollow casting 14: is clamped to the cylinder jacket 13 by means ofsuitable clamp ng bolts or screws 15 and fits upon the flange 12 of thecylinder wall, there being pressure tight gaskets, preferably of thecopper asbestos type between the flange 12 of the cylinder wall and theupper face of the cylinder jacket 13 and the lower face of the hollowcasing 14: respectively, so that the upper end of the cylinder wall isri 'dly clamped in place by the tightening of the clan'iping screws 15.The hollow casing 14 forms a cylinder head and the space between itswalls constitutes a water jacket communicating with the water jacketsurrounding the cylinder by means of a by-pass formed by an elbowconnection 16 bolted to the cylinder jacket 13 and the casing 14:respectively. The cylinder head 14 also contains the valve pockets 17 inwhich the valves 18 are seated. r

The lower end of the cylinder wall 10 is free to expand or contractlongitudinally without hindrance and thenovelty of the present inventionrelates particularly to the means for maintaining a water tight closurefor the water jacket around the cylinder wall at this longitudinallymovable lower end of the cylinder wall. The outer surface of the lowerend of the cylinder wall is ac curately turned to produce concentriccylindrical bearing surfaces 19 and 20, one a short distance above theother and of somewhat larger diameter with an inclined or tapering wall21 therebetween .while the cylinder jacket is bored cylindrically toform two concentric bearing faces 22 and 23 respectively of differentdiameters. the former to have a tight working fit with the hearingsurface 19 of the cylinder wall and the latter to have a tight workingfit with the bearing surface 20 of the cylinder wall.

The surface 2 1 joining the bearing surfaces 22 and 23 is preferably ata plane at right angles to the axis of the cylinder so that the annularspace around the cylinder wall is approximately triangular in crosssection, though the short wall formed by the surface '20 is parallelwith the wall formed by the bearing surface 22 and the longitudinalexpansion and contraction of the cylinder wall incident to the varyingtemperature thereof shortens or lengthens these walls of the annularspace. Within this annular space are rubber rings or gaskets 25 whichoccupy all but the apex of the space in the normal position of the endof the cylinder 1 wall, but which are crowded together and forcedupwardly to fill the apex of the space as the end of the cylinder wallmoves downwardly under expansion of higher temperatures, such crowdingof the rubber gaskets being effected by the cam action of the inclinedor tapering surface 21 tending to force the rubber more tightly againstthe surfaces 22 and 24 with the reduction in size of the annular space.As the cylinder wall contracts on cooling the resiliency of the rubbergaskets causes them to maintain their water tight packing between thecylinder wall and the cylinder jacket so that 'the water is preventedfrom leaking from the water jacket at all times. By only partiallyfilling the annular space with the rubber gaskets suflicient vacantspace is left in the upper part thereof in which the rubber may expandand contract to maintain a water tight connection in either the expandedor contracted condition of the cylinder wall.

What I claim as new and desire to secure by Letters Patent is:

1. In a gas engine, a cylinder jacket, a cylinder wall slidably fittedtherein with an annular space therebetween having an inclined wall, suchannular space varying in sectional area with the expansion andcontraction of the cylinder wall incident to the temperature variationsthereof, and a resilient gasket fitting in the annular space and adaptedto be crowded by the inclined wall of the annular space against theopposite wall thereof by the longitudinal movements of the cylinderwall.

2. In a gas engine, a cylinder jacket having a pair of concentricbearing surfaces of different diameters, a cylinder wall havingcorresponding concentric bearing surfaces slidably fitting against thebearing surfaces of the cylinder jacket, there being a tapering surfacebetween one pair of bearing surfaces forming a wall of an annular spacebetween the cylinder wall and the cylinder jacket and a resilient gasketcontained in the annular space.

3. In a gas engine, a cylinder jacket, a cylinder wall within thecylinder jacket having a flange at one end thereof seated upon thecylinder jacket, a cylinder head seated upon the flange of the cylinderwall, clamping means connecting the cylinder head with the cylinderjacket to clamp the flange of the cylinder wall therebetween,

cupy the annular space by the longitudinal movement of the end of thecylinder Wall incident to the expansion thereof.

4. In a gas engine, a cylinder jacket, 3; cylinder wall therein with anannular flange at one end seated on the end of the cylinder jacket witha space between the cylinder wall and the cylinder jacket to containwater, a hollow cylinder head fitting on the flange of the cylinder walland containing concentric bearing surfaces ofvalve pockets, the spacewithin the cylinder head around the valve pockets being adapted tocontain water, clamping means connecting the cylinder head with thecylinder jacket to clamp the flange of the cylinder wall therebetween, aby-pass connecting the water space of the cylinder jacketwith the waterspace of the cylinder head, there being concentric bearing surfaces ofdifferent diameters at the other end of the cylinder wall with atapering cam surface therebetween and corresponding concentric bearingsurfaces in the cylinder jacket within which the bearing surfaces of thecylinder wall slidably fit, said tapering cam surface of the cylinderwall forming one Wall of an annular space between the bearing surfacesof the cylinder wall and the cylinder jacket, and a rubber gasketpartially occupying the annular space and adapted to be compressed bythe cam surface to more completely occupy the annular space by thelongitudinal movement of the end of the cylinder wall incident to theexpansion thereof.

In testimony whereof, I afiix my signa ture, in presence of twowitnesses.

FRANK M. DAVIS.

\Vitnesses \VM. NELSON, FRANKLIN Znmiuonrlsn.

